Screw jack



Aug. 6, 1929. R. J. MUCH l 1,723,970

SCREW JACK Filed June 19. .192s

ATTORNEY Patented Aug. 6., 19,29.

UNITED STATES PATENT OFFICE. i

ROBERT J. JAUCH, 0F FORT WAYNE, INDIANA, ASSIGNOR, T0 UTTLITY STIR'AUEMANU- FACTURING COMPANY, y0F FORT WAYNE, INDIANA.

SCREW JACK.

Application filed June 18,

This invention relates to improvements in screw jacks, especiallyadaptable for straightening structures that have been damaged or sprungout of their normal form, such as automobile chassis frames.

The object obthe invention is to provide an equipment y means of whlchchassis frames that have become disarranged may be forced back intoproper form without d1smembering the frame structure. I Another objectis to so construct the equ1pment that it may be applied readily to thechassis. frameand force applied 1n opposite directions to points more'or less remote fromV each other. And another object is to provide ascrew jack equipment with' interchangeable extension mem ers by whichthe length of the jack may be greatly varied as occasion for its use mayrequire.

These objects are laccomplished by the construction illustrated in theaccompanying drawings, in which VFig. 1 is a side view of a screw jaclrembodying the invention, including a pair of `removable extensionmembers, portions be' ing broken away;

Fig. 2 is a fragmentary side view of the screw jack including adifferent pair of eX- tension members Fig. '3 is a similar view showingthe screw `jack including one of the extension members shown in Fig. 2;

Fig. 4 is a fragmentary view `of the screw jack without the use of anextension mem- ,balm

Fzig. y5 is a rear end view of one of the end tips used in theappliance;

Fig. 6 is an elevation projected from Fig. 5; and v Fig. 7 is a planview of the screw Jack 4applied to a frame as it appears in use, theframe being fragmentary.

The characters appearing in the ,description refer to parts shown intheV drawings and designated thereon by corresponding characters.

The invention consists of an operating member having ahead 1 from eachend of whichextends a threaded stud 2 `and 3 respectively, the spiral ofthe threads on the stud 2 being opposed, as to direction, to those onthe stud 3. The head has made therein a `series of sockets 4 for the,recep tion of a handle 5 by which theloperating member is turned.

1928. Serial No. 286,331.

Uponeach of said studs is a corresponding sleeve 6 that has threadedrelation therewith, each sleeve having an external flange 7 at its innerend.

An extension member 8 consisting of a tube is lremovably ipositioned oneach sleeve, which sleeve telescopes t e corresponding tube, the-flange.7 of the sleeve forming a' shoulder that -bears against theAcorresponding end of the tube when the latter is in place.- Inthe-outer end of each tube 8 is removably positioned a tip 9 having ahead 10, the outer end of which is preferably wedge shaped, and with atrans verse notch 10 therein, and its inner end being provided with astud 11 having a series of annular shoulders 12-12 one of which beingsagainst the corresponding end of the tu For instances where a jack ofgreater ,length is required a pair of tubes 13 are appliedinterchangeabl with the tubes 8, and also there is provi ed anadditional ex tension tube 14 for each tube 13 which additional tube hastelescopic relation with the corresponding tub'e 13. The tubes 13 havemade therein aseries of perforations 15, and a pin 16 extends throughthe tube 14 and through corresponding nerforations in the tube 13whereby the tubes 13 and 14 are held in adjusted positions relative toeach other. The perforations 15 in the tube 13 are spaced longitudinallywith res ect to said tube which admits of securing t e tube 14 invarious positions upon the tube 13, and in this manner the length of thejack may be varied. When the tube 14 is applied the stud of thetipextends its full length into the outer end of said tube, and the head10 of the tip bears directly against the adjacent end of said tube.

For instances where a jack of comparative short length is required, theextension tubes 8, 13 and 14 may be dispensed with, in which event `thetips may be applied directly to the sleeves with the small ends 17extending into. the outer ends of the sleeves respectively, which endsbear against the shoulders 12 on the studs of the corresponding tips.

In utilizing the invention, the operating member is turned in thesleeves until the sleeves closely approach the head 1, and the tips areapplied to the outer ends of the sleeves, or, one or the other of theextension tubes 8 or 13 is placed telescopically onto the sleeves andthe tips are inserted in the outer ends thereof. When ajack ofintermediate length is required, one of the extension tubes ma beomitted. With the parts thus assemble the jack is applied to the framemembers 18 and cross braces 1?, as indicated in Fig. 7, with the tipsinserted at the corresponding junctures of the frame members and braces.By turning the ,head 1 of the operating member by means of the handle 5,more or lessI endwise pressure of the jack is exerted between its pointsof contact with the frame members 4and braces and with more or lessendwise expansion according tothe extent the operating member is turned.The jack maybe applied in various other positions and to variousy otherobjects where force is required in moving objects apart. Y

The tips being wedge shaped at their outer ends fit lnore or less snuglyin the corners between the side members and braces, and'in this mannerturning movement of the tips upon their` axis is prevented. It has beenfound that the frictional contact between the tips and their sleeves, ortheir frictional contact with the extension tubes and the end thrust ofthe tubes on'the sleeves are such, when the j ack is in place, thatturning movement of the sleeves is prevented las the operating member isactuated.

The outer ends of the tips being wedge shaped, when bearing forciblyagainst an object, resist turning movement which facilitatesmanipulation of the operating member.

W'hen the tip is applied to a rod, bead or flange, the notch 10 admitsof placing the tip astride of such objects so that turning movement ofthe tip is thereby prevented.

lV hat I claim is 1. In a screw jack, an operating member having a headand oppositely disposed threaded studs, the spiral of the thread on theone stud being opposed to that on the other; a sleeve on each of saidstuds, having threaded relation therewith and being provided at itsinner end with an external annular flange; an extension memberconsisting of a pair of telescoping tubes adjustably and removablyconnected together, one of said tubes having telescopind relation withthe corresponding sleeve and bearing relation With the flangel thereon,there being another similar lextension member applicable to the other ofsaid sleeves in like manner; andl a pair of tips, each having a head,the inner end of which has a stud provided with a series of concentricshoulders and being applicable to lit interchangeably in thecorresponding-outer ends of said tubes and sleeve, said shouldersforming corresponding end-thrust bearings therefor.

2. In a screw jack, an operating member havin a head and oppositelydisposed threat ed studs' with right and left hand threads respectively;a sleeve on each of said studs having threaded relation therewith andbeing provided at its inner end with an external flange; a tubularextension member for each sleeve, said extension having teleseopingrelation with and being removable from the sleeve, one end of saidextension having bearing relation with said flange; and tips havingcorresponding studs provided with concentric shoulders and beingapplicable to fit interchangeably in the corresponding outer ends ofsaid tubular extensions and sleeves, said shoulders formingcorresponding end-thrust bearings therefor.

In a screw jack, an operating member having a head and oppositelydisposed studs with right and left hand threads respectively; ,a sleeveon each of said studs having threaded relation therewith provided at itsinner end with a shoulder; a tubular extension for each sleeve havingtelescoping relation therewith, one end of which tube bears against saidshoulder; and a pair of tips, each'having a wedge-shaped outer end and astud on its inner end provided with concentric'A shoulders, said tipsbeing interchangeably applicable to the outer ends of the correspondingtubes and sleeeves, the shoulders on said studs forming-end-thrustbearings for the corresponding ends of said tubes and sleeve.

In testimony whereof I aflix my signature.

ROBERT J J AUCH.

